Printing mechanism for calculating machines



June 30, 1931. c. o. MAPEL PRINTING MECHANISM FOR CALCULATING MACHINESFiled y 1926 4 Sheets-Sheet l \W 7, WW

mvgmoa CYHIZIZC 011111769065 ATTORNEY June 30, 1931. c. o. MAPELPRINTING MECHANISM FOR CALCULATING MACHINES Filed July 15. 1926 4Sheets-Sheet 2 INVENTOR I Chremsflr W 155i ATTORNEY June 30, 1931. c. o.MAPEL PRINTING MECHANISM FOR CALCULATING MACHINES Filed July 15, 1926 4Sheets-Sheet 3 ATTQRNEY c. o. MAPEL PRINTING MECHANISM FOR CALCULATINGMACHINES June 30, 1931.

Filed July l5, 1926 4 Sheets-Sheet 4 A... ATTORNEY INVENTORClarenwflrinifqfd Patented June 30, 1931 UNITED STATES PATENT OFFICECLARENCE CRIN MAIEL, OF CHICAGO, ILLINOIS, ASSIGNOR TO PORTABLE ADDINGMACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOISPRINTING MECHANISM FOR CALCULATING MACHINES Application filed July 15,1926. Serial No. 122,610.

This invention relates to improvements in printing mechanism forcalculating Inachines, and has for its objects to provide simple andetlicient means whereby ciphers in an amount; to be listed will beprinted. without the necessity of actuating cipher keys in the keyboardof the machine; to provide printing mechanism for adding and listingmachines, which, in adding or simple listing operations, will printciphers only in. the decimal order positions corresponding with decimalorder key rows in which no key is depressed located to the right of thekey row of highest decimal order in which a key is depressed, except inthe case of the two extreme right-hand decimal order positions, in eachof which a cipher Will be always printed unless a digit key has beenset; and to provide automatic cipher-printing mechanism especiallyadapted for embodiment in the calculating machine disclosed in theco-pending application of Glenn J. Barrett, Serial No. 50,219, filedAugust 14, 1925.

In the accompanying drawings, wherein the invention is illustrated inits preferred embodiment,

Figure l is a right-hand side elevation of an adding machine equippedwith the improved printing mechanism, certain parts,

@ includi the ribbon mechanism. and outer casing, ing omitted;

H fragmentary lelthand side elevation the machine;

3: detail view, partly in vertical secti on, so ring", the automaticrestoring or releasin "icons for "the digit keys and the locki n ps andcipher stops in action;

4 vertical longitudinal sectional the chine, taken in the plane or oi?Fig. 9, the being in norsectional view similar .5 showing the digit key3 1n the column as from right depressed an d the pans in the l e end ofthe c handle or act of printing s roke of the op 4. l in the the amointo Fig. (3 a de perspective View showing Fig. 8- a detail perspectiveview showing one of the cipher stops and its co-operating locking stopand the shouldered pivot pin for connecting the two stops indisassembled relation; and

Fig. 9 a detail plan view of the series of locking and cipher stops forthe type-carrymg sectors. 7

I have shown, and will describe, only so much of the calculating machineas is neces sary'to a full understanding of the operation of theimproved printing mechanism. Encept as modified by the presentimprovements, as hereinafter pointed out, the machine illustrated isconstructed as disclosed in the Barrett application referred to above,and substantially as physically embodied in the calculating machinecommercially known as the portable.

The working. parts of the machine are mounted in a skeleton main frame 1preferahly housed in an outer casing 2. The accumulator pinions 3 areloosely journalled. on a shaft 4 extending between two: similar rockarms 5 within framework 1. Rock arms 5., and a third rock arm 6 locatedoutside of "frame 1, are all fixed on a rock shaft 7 journalled in saidframe and are con nee at their forward ends by a t rod 8 passing througha slot 9 in the lrame l. The i coking support for the accumulator d vnup nto the position shown a spring 10 connecting such the res one of heea r 11 which are dly in ii The adding 2-1 of the accui u 1 ton i whichthere a in the machine shown) normally in the teeth of the ing sectorsor os lie oscillating the machine.

and is provn cket connection through slots 18 in the bars. Stud bolts 19a 17 are -on links 16 pass through the. foremost slots 18 in bars 17 andare normally held engaged against the forward ends of said slots by srings 20 which connect links 16 and bars 17. Along their upper edgesbars 17 are each provided with nine digit stop lugs 21 laterallystaggered and arranged from front to,

rear to engage respectively with the lower ends of the reciprocablestems or stop plungers 22 carrying the second to tenth keys,

respectively, from front to rear of the fore-- and-aft-extending columnof keys thereabove.

The second to tenth keys in each decimal order row are the digit keysand are provided on their faces with the numerals 1 to 9 respectively,not shown. There is a tenth key in each column of the keyboard forwardof the digit keys 23. These front keys 23" are carried on reciprocableplungers or stems 22, and are not provided with numer- Each sector isformed with a projection or shoulder 33 normally engaged by the forwardedge of the cross-bar of a swinging restoring bail 34 to hold thesectors and parts connected therewith in the'positions shown in Fig. 4against the pull of the operating springs 35-. One spring 35 connectseach sector 32 with the anchor bar 36 which is fixed in frame 1', andthese springs are normally under tension and pass over the grooved hubs37 of the sectors 32 to anchor pins 38 on the sectors. Each sector 32carries on its normally rearwardly facing arcuate edge a vertical seriesof ten numeral types 39, the uppermost type being a cipher type and theother types being the digit types 1 to 9, respectively, from thecipher-type to the lower end of the series. Each adding sector 12 hasone type sector 32 arranged alon side the opposite face thereof fromthat ace with which the associated link 16 is connected, and has also alost-motion connection with the said type secs tor (comprising headedstuds 40 fixed on the type sector and extending through short arcuateslots 41 in the adding sector) aral characters. These keys 23 arepreferably/ ranged to permit relative rotation between colored incontrast with the digit keys and as hereinafter set forth, said keys 23function as column correction keys.

The key stems 22 and 22 are slidably guided to move endwise in slots inguide members 24 and 24 supported in the main .1 and extend throughslots '29 in key stems 22 and 22' below slots 27, and said bars arenotched along their upper edges to form on each bar ten downwardly andrearwardly extendin cam edges 30 normally extending throng slots 29. Atthe lower end of each cam edge 30 extending through adigit key stem 22,each of the slide bars 28 is cut away forwardly to form locking recessesor notches 31 in which are adapted to engage the portions22 of the di 1tkeys located between the adjacent ends 0 slots 27 and 29, for'the(purpose of locking the stem of a depresse digit key down, as shown inFig. 5,1n position for engagement of its associated digit stop lug21therewith. No lockin reoess 31 and no stop lug on stop-carryin arsrovided for co-oper'ation wit the stems o the column correction keys 23,and, in this respect, the present construction differs from that shownin the Barrett application and from the commercial machine rested onreturn movement thereof by stop the accumulator frame and have noses 45on lugs 42 thereon engaging the rearwar 1y extending arms of thethree-arm transfer pawls 43. The pawls 43 are pivoted on a rod 44 intheir forwardly extending arms having substantially vertical rear edgesengaged by the trip fingers 46 fixed on the adding pinions when theaccumulator is clear and having. beveled forward edges over w ich thetrip fingers46 ride to trip the transfer pawls to permit the one-stetransfer or carrying movement of the adding sectors. The transfer pawls43 are held in normal position b springs 47 connecting the pawls withlate levers 48 pivoted on a'rod 49 in the accumulator frame, said pawlshaving laterally extendin lugs 50 on the depending arms thereo normallyengaged under the lower edge of levers 48 just forward of lockingnotches 51 in the lower edges of said levers. When a transfer pawl istri ped by a finger 46 its lug 50 engages in note 51 in the associatedlatch lever 48, the free end of which lever swings down onto a stop rod52 in frame 1 to lock the pawl with its free end above the path of stolug 42 on the associated adding sector 12. l ripped pawls are re-set rautomatically after an adding operation by the downward rocking of theaccumulator frame upon the forward stroke of the main operating handle14 in connection with a succeeding adding operation or in connectionwith a blank or idle operation prior to taking a total. It will beapparent from a comparison of Figs. 4 and 5 that, if a pawl 43 betripped while the adding pinions and sectors are in mesh, upon downwardrocking of the accumulator frame to the position shown in Fig. 5, lug onthe pawl is freed from notch 51 and'will be drawn forward to normalposition by spring 47. A stop rod 53 limits swinging movements of theaccumulator frame.

- The side arms of bail 34 are loosely journalled on shaft 13 atopposite sides of the two interspersed series of adding sectors 12 andtype sectors 32, and the side arm at the left side'of the bail isprovided with an extension 34 normally extending downward from shaft 18opposite the normally depending arm of a Y-shaped rocker plate 54.Rocker plate 54 is loosely journalled on shaft 13 and its normallydepending arm is rigidly connected with bail arm extension 34*- by ashort transverse rod 55. A fore-and-aft-extending link 56 (Fig. 2) ispivotally connected at its rear end to the left-hand end of rod and ispivotally connected at its forward end at 58 to the forward end of arock arm 59. Rock arm 59 is pivoted at 60 on frame 1 at the outer sideof said frame to rock up and down, and said rock arm carries a contactroller 51 its forward end adapted to work in a cam slot in anoscillating cam plate 62 fixed on the left-hand end of shaft 13 outsideframe 1 to oscillate with said shaft. The cam plate 62 has a high dwellportion 62 at one end of the slot therein, and a low dwell portion 62 atthe opposite end of said slot, connected by an intermediate activeportion 62 arranged to force roller 61 and the forward end of arm 59upward and rearward during the intermediate portion of the forwardstroke of handle 14 and cause downward and forward movement of said armand roller under pull of the heavy bail-restoring spring 63 and the mainhandlerestoring spring 64 during the intermediate portion of the returnmotion of the handle, said arm and roller and the connected bailremaining stationary during the remaining or end portions of each handlestroke. Sapring 63 is connected rod 55 and me rod 65, and spring isanchored at i forward end to frame 1 and connected at rear by a cord 66over pulley 67 journalled 57 r cam plate 52.

y 58 carried hy arm 59 war as in a slot in name 1. The transverse bar ofbail 34 worlrs curved slots 12 in the adding sectors 12, and therearmost of the two upper arms of rocker 54 is adapted to engage one ofthe frame rods 11 (as shown in Fig. to limit rearward movement of thebail bar. The other arm of plate 54 carries a stud 69 which co-operateswith the depend: ing arm 70 of a pivotally mounted locking bail 70 onframe 1 to normally hold the transverse bar of said bail out of lockingnotches 71 in the key-stem locking slide bars 28, and to permit saidbail bar to drop by gravity into said nOtches (as shown in Fig.5) toprevent manipulation of keys of the keyboard after the operator startsactuation of handle 14.

The accumulator frame 5, 6, 8 is adapted to be rocked downward in addingoperations by a cam 72 fixed on shaft 13 between handle 14 and theright-hand side of frame 1. Cam 72 has an active cam edge portion 7 2normally extending to a point forward of and above a contact roller 7 3journalled on the upper end of a pivoted control device 74. Device 74 isjournalled at 75 on rock arm 6 of the accumulator frame forward of rockshaft 7 and its upper portion is normally rocked rearward against a stoppin 76 on arm 6 by a spring 77 connecting pin 76 with a pin 78 on theupper portion of said device. Cam 72 has a holding or high edge portion72 concentric with shaft 13, extending up around the shaft from theforward end of the active cam edge portion 72 Cam 72 is designed todepress the accumulator frame during the initial part of the forwardstroke of handle 14 to carry the accumu lator pinions 3 out of mesh withadding racks 12 before bail 34 begins to swing rearward. The accumulatorframe is held demeshed until handle 14 is released and begins itsrearward. stroke, whereupon the frictional dragof holding edge 72 of thecam or roller 73 (preferably augmented by a notch 7 2 in said cam edgewhich passes slightly to the rear of the roller at the end of theforward handle stroke) swings device 74 on its pivot against the lightspring 77 until roller 73 passes over the pivot center of the deviceyandthe accumulator frame is then drawn up by spring 10 to carry the pinions3 into mesh with the racks 1.2 before bail 34 begins its return orforward adding-rack-restoring movement. The pinions will normally remainin mesh until another adding operation of handle 14 is made. t e device74 automatically being re stored iormal. position by its spring uponreturn 0:. cam 72 to normal position.

The platen 79 mounted. on a platen shaft 80 jotinalled in a rockingplaten frame 81 fixed on rock shaft 82 journalled The platen is adaptedto be rocked from the position shown fuli lines in Figs. 1

' inting position (shown in and in full lines in Fig. 5) by means oflink 83 pivoted to cam 72 at 84 and carrying a stud 85 at its rear endinterlocked in notch 86 in a rocker plate 87 fixed on rock shaft t willbe observed 4 and 5 that the uppermost types Ipes) on the type-carryingsector-s umns.

said application and machine hereinbefore referred to,

Except as hereinbefore pointed out, the several parts above describedare constructed and arranged substantially as disclosed in theapplication and machine before mentioned; In said machine andapplication, the adding sector stop bars 17 carried cipher stop lugs attheir forward ends arranged so that the stems of the front transverserow of keys corre sponding with keys 23 would, when depressed, move downdirectly in front of said stops and prevent any movement of said bars.Locking notches 31 were provided for these key stems and it wasnecessary to depress one of these keys in each column in which it wasdesired to print a cipher. A single series of stops was providednormally arranged to stand in front of stop fingers 88 on the typesectors 32 and hold each of said sectors with the cipher. type thereonbelow the printing line during adding operations of handle 14, exceptwhen either a digit key or a cipher ke of said machine in thecorresponding co umn of the keyboard was depressed. I have providedmeanswhereby desired ciphers are automatically printed without printingundesired ciphers to the left of the highest decimal order of the numberbeing printed. I have, in' the preferred'construction shown, providedmeans whereby ciphers will be always printed inthe two right-hand col-.umns unless a digit key is set in these col- The novel provisions foreffecting automatic cipher printing will be now de scribed.

A series of cipherrinting-position deter-- minin stops A, B, CED, E, Fand G are arrange for co-operation with the stop fingers 88 on thetype-carrying sectors 32. These cipher-t peprinting-position-determining sto s eac comprise a lever. ofsubstantially bel -crank form in side elevation, loosely pivoted on atransverse frame rod 90. The for ward arms of the stop levers extendupward alongside the rear portions of the adjacent key-stem-lockingslide bars 28 and said arms are provided, respectivel with laterallybent lugs A, ,B, C, D, E, F and G pressed against the rear end edges ofthe slide bars 28 by double-acting coiled springs 91.- a The springs 91are connected at their forward ends to bars 28 and extend rearwardlyover rod 90 and are anchored to laterally bent lugs 92 on the upperedges of the rear arms of the cipher-type printing-position-determiningstop levers, and by their contractile action normally-tend to move eachinter-engaged slide bar and stop lever to the position shown in Figs. 1,2, 4 and 6 and maintain the same in such position. The rearwardlyextending arms of these stop levers are provided with laterall bent stoplugs A, B C D E, F and G respectivel arranged in the aths of movement oft e respective stop ngers 88 on printing sectors 32. These stop lugs arealigned transversely of the machine at such a distance forward of thenormal positions of stop fingers 88 as to be engaged by said fingers tostop rotation s of sectors 32 when the cipher types on the sectors haveadvanced to the printing line.

As the series of sectors'32 is not as wide as the series of slide bars28, I have provided the necessary contraction by making two stop leversat each end of the series of broad skeleton form, as shown, so that theyhave double bearings on rod 90'with their rear arms comprising twolaterally off-set portions connected by transverse webs so disposed asto not interfere with independent pivotal movements of adjacent stoplevers or pivotal movements of adjacent locking stops for the printing Isectors. The sto levers are suitably spaced on rod 90, as y double hubsH .on leve-rs C and E, a single hub H on lever D, and four. loosespacing sleeves S on rod 90, as shown. l

. The series of type-sector locking stops comprises pawls or dogs 0, d,e, f and 9 arranged alongside of the rear stop-lug-carrying arms of stoplevers C, D, E, F and G, respectively. These locking dogs are pivot-allyheld at their forward ends to said lever arms by pivot studs 93, thereduced ends of the shanks of which are passed through small holes 94 insaid lever arms and peened over. The stop levers and dogs are preferablyformed of 1 are preferabl slightly off-set laterally from the adjacentaces of the lever armsto which they are pivoted to reduce the frictionalcontact, and small spacing bosses or studs 123 are punched up from theoff-setportions of the dogs and engage the lever arm faces near theforward ends of the arms.

The stop lug on each of the lever arms passes through a notch 95 in thelower edge of the dog which is pivoted on'that lever arm, and normallyengages the top wall of said notch to support the dog adjacent itsforward end in such position that a laterally bent sectorlocking lug onthe end of the dog is maintained directlyin front of the stop finger 88on the associated type sector 32 to prevent any appreciable advance ofthe stop-fin er toward the cipher-type printing-position-determiningstop lug on the lever arm to which ally toward the left to a pointoverhanging the upper edge of the next dog to the left thereof. In theconstruction shown these lifting lugs 0 (Z 6 f and g are so arrangedthat the left-hand end of each lug normally rests on top of theright-hand end of the next lifting lug to the left thereof. Theselocking lugs are returned to and held in normal position by gravityaction.

Adding and listing operation In Figs. 5 and 7 the parts are shown inposition for printing 300.00 on the paper web in connection with anoperation of the machine for accumulating this amount in theaccumulator, and a description of this adding and listing operation willmake clear the mode of action of the novel printing mechanism in addingand listing operations, as well as in simple listing operations Wherethe number is listed without an action of the accumulator. To add andlist this amount the operator simply presses down the digit key in thefifth column from the right of the keyboard bearing the indication 3(which, inthe machine shown, is the fourth key from the forward end ofthe column), removes his finger from the key and draws forward handle 14to the forward limit of its throw and then releases the handle for itsreturn by spring 64. Depression of the digit key cams the associatedlocking slide bar 28 endwise forward against the pull of spring 91 untilthe web 22 of the key stem 22 is opposite locking recess 31, whereuponthe bar will snap rearward a slight distance toward its normal position,to the position shown in Figs. 5 and 7, to lock the digit key and itsstem 22 in depressed position with the lower end of the key stem in thepath of the third stop lug 21 from the front end of the fifthadding-sector movement-controlling slide bar 17 from the right. Movementof the keylocking slide bar 28 to locking position causes rocking of itsassociated stop lever E about its pivot, due to pull of the connectingspring 91, sufficient to carry the cipher-typeprinting-position-determining lug E above the path of advance of stopfinger 88 on the fifth sector 32 from the right of the machine. Theupward movement of lug E causes type-sector-locking dog 6 to move bodilyin unison with lever E to carry locking lug e on said dog also above thepatch of advance of finger 88. The movement of dog 6 up to idle positionlifts all the dogs to the fight thereof to idle position by swingingsaid dogs about their pivots 93 through the action of the overlappedlifting lugs 0 d 0 without rocking an of the stop levers located ateither side of lever E and without swinging the dogs f and 9 about theirpivots 93.

When handle 14 is drawn forward bail 34 swings toward the rear from theposition shown in Fig. 4 to the position shown in Fig. 5 so that theadding sectors are free to turn in a counter-clockwise direction for afull excursion except as restrained by a locking stop or cipher-typeprinting-position-determining stop or a set digit key stem 22. In theexample shown, the two left-hand typesectors will be held againstrotation by their connected advancing springs 35, by the locking stops fand g on locking dogs f and g, with their cipher types below theprinting line. Since these two type sectors cant rotate it will beobvious that the two adding sectors connected therewith will reman innormal position, as shown in Figs. 5 and 7. The next type sector to theright will first advance until studs 40 thereon move to the oppositeends of slots 41 from the position shown in Fig. 4. Each sector 32 isconnected with its associated adding sector 12 by a spring 96, and thetwo associated sectors are normally held in the relative positions shownin Figs. 4 and 6, with their connecting spring under tension, byengagement of bail 34 with shoulder 33 on the type sector 32 andengagement of stop lug 42 on adding sector 12 with the rearwardlyextending stop arm of that transfer lever 43 which is arranged fortripping in carrying operations by that trip finger 46 which rotateswith the adding pinion 3 of the next lower decimal order.

The above-described preliminary advance of the third type sector fromthe left (during which studs 40 move to theopposite ends of slots 41 inthe associated adding sector) is sufficient to advance the cipher typeon this type sector to the printing line while the adding sector remainsstationary and spring 96 contracts. After the lost motion is taken upthis type sector will drive the connected. I

make the same preliminary cipher-type po-.

sitioning movement but will be arrested when their studs 40 reach theopposite ends of slots 41 in their connected addin sectors (as shown inFig. 7), by reason 0" the en gagement of fingers 88 with the cipher-typeprlnting-position-determining stop lugs A B C and l) on stop levers A,B, C and D, and there will be no movement of the adding sectorsconnected with these four right-hand printing sectors. I

As hereinbefore described, the pinions 3 are carried down out of meshwith adding sectors 12 by the action of cam 72 before any movement ofsectors 12 can take place, and are held out of mesh until the handle 14is released and begins its return stroke. The platen 79 is forcedforward by cam 72 and link 83 and is pressed thereby against those typeswhich are advanced to the printing line (in the example shown, the types300.00)

at the end of the forward stroke of handle 14.

and it will be remembered that bail 34 completes its full excursionbefore the handle 14 reaches the forward limit ofits stroke, so that theimpression takes place after the movement of the sectors is'completed'When handle 14 is released it is returned to normal position and bail 34also is moved back to normal position by the means before described.During the return stroke-of the handle the platen returnsto normalposition and the amount set up onthe keyboard is carried into theaccumulator. Through the connections before described, the pinions 3 arecarired up into mesh with the racks during the first part of the returnmovement of the handle before bail 34 begins its return movement. Bail,34 then moves forward,

picking up the shoulders 33 of any type secby engagement of its lug 42with the associated transfer lever, thusrotating the associated pinionthree tooth spaces from its previous position in counter-clockwise .di-

rection'to efl'ect adding.- The bail then also picksup the shoulders 33of the four right-- hand type sectors and moves all five oftheright-hand type sectors relatively to their connected adding sectorsuntil studs 40' travel from those ends of slots 41 at which they are shown in Figs. 5 and 7 to the opposite ends of the slots, re-tensioningthe springs The lost-motion connection 4041 and spring connection 96between each printing sector and its connected adding sector areutilized to provide for a one tooth-space return motion of the addingrack beyond normal position when the transfer lever 43 cooperating withits stop lug 42 is tripped by the transfer trip finger 46 of the nextlower frame 97 normally engaging under a stop pin 99 on frame 1 todetermine the normal position of slides 28 and the locking stops andcipher-type printing position determining stops which co-operate withthe fingers 88 on type sectors 32. A stop and digit key restor ng bail100 is pivoted on a rod 101 carried by the side arms of frame 97 and itscross-bar extends behind a. rearwardly facing shoulder 97 on theright-hand side arm of frame 97 and the rearwardly facing cam edge 105of a bell-crank key lever 106 and is normally held against said shoulderand cam edge by a spring 102 which is anchored to the crossbars of frame97 and bail 100. One side arm of bail 100 depends below its pivot andcarries a contact pin 103. A trip roller 104 ournalled on cam 72 ridesunder pin 103 and imparts an idle rockin movement to bail return strokeof handle 14, said roller rocks bail 100 and, through said bail, rocksframe 97 as shown in Fig. 3, thereby forcing locking bars 28 forward tocarry the lockin notches 31 forward of webs'22 of the digit Eey stems sothat any depressed digit keys will be snapped up to normal position bytheir return springs 25. This tilting movement of: frame 97 alsotemporarily carries all the locking stops and cipher-typeprinting-positiondetermining stops up out of the path of fingers 88 onsectors 32 being returned by bail 34. After roller 104 passes to therear of pin 103, the slides, frame, bail and two series of stops assumenormal position.

he bell-crank key lever 106 carries a combined repeat and errorkey 107on its upstand ing forward arm and is pivoted on a stud 108 carried bythe left-hand side arm of pivoted frame 97. Key lever 106 is normallyfrictionally held by a suitable friction device, not shown, with thefront edge of its keycarrying arm abutting the rear edge of a stop lug109 on the left-hand side arm of Jun normal position prior to operatinghandle 14, cam edge 105 of key lever 106 will rock bail 100 against thepull of spring 102 to lift con tact pin 103 on said bail out of the pathof trip roller 104 on cam 72 so that depressed digit keys and anytype-sector-locking stops and cipher-type printing-position-determiningstops lifted by the depressed digit keys will not be restored on returnof handle 14 and the number set up in the keyboard may be repeatedlyadded into the accumulator by successive operations of the handle 14until key lever 106 is restored manually to normal position. The edge105 of key lever 106 is provided with a locking notch .110 adapted toreceive the edge of bail 100 to prevent accidental return of the keylever from repeat position to normal position.

Any digit key 23 erroneously depressed in a particular column may bere-set by depressing of the proper digit key in said column, or if nodigit key should have been depressed in that column said erroneouslydepressed digit key 23 may be restored by depressing and releasing thecolumn correction key 23 at the forward end of that column of thekeyboard. It will be recalled that no locking notches 31 are providedfor the stems 22 of correction keys 23 so that said keys 23 will rise assoon as released, and the locking slide bar 28 cammed forward bydepressing a key 23 will return rearward to-its normal position andrestore to normal position the cipher-type printing-position-determiningstop and the type sector locking stop associated with said slide bar.

The means employed for preventing adding of a number set up in thekeyboard upon actuation of handle 14, and the means employed for takingtotals, indicated in the drawings, are the same as those disclosed inthe co-pending application and machine heretofore referred to, saidmeans being controlled by the non-add key 111 and total key 112, andincluding the cam plate 113 pivoted at 114 on frame 1 and normally heldin the position shown in Fig. 1 by spring 115. The operation of theprinting mechanism innonadd operations is exactly the same as in addingand listing operations. I

In taking totals, the depression of the total key 112 not only causesthe adding pinions 3 to be meshed with adding sectors 12 during theforward stroke of handle 14 so as to cause driving of any advancedpinions in reverse direction (clockwise direction as viewed in Fig. 4)to their zero positions in which fingers 46 abut against the straightfaces of noses 45 of the transfer levers 43 to stop the counterclockwiserotation of sectors 12 and 32 with the proper type at the printing line,but also rocks frame 97 to the position shown in Fig.

' 3, by the action of cam edge 116 of cam plate 113 on a stud 117 onframe 97. This rocking of frame 97 lifts all the locking stops and allthe cipher-type printing-position-determining stops up above the path oftype-sector fingers 88 so that, when handle 14 is drawn forward withtotal key 112 depressed, all the type sectors first advance to carrytheir cipher type to the printing line and take up the lost motion inconnections 4041 with the adding sectors, and then any adding sectorswhose meshed pinions are advanced from zero position will rotate oneor'more toothspaces in reverse direction from adding direction untiltheir pinions reach zero, and the type sectors associated withsaid'adding sectors will advance from cipher-printing position with saidsectors a corresponding number of type spaces, thereby setting up on thetype sectors the amount which had been accumulated in the accumulator,and printing the same when the platen moves forward against the type atthe end of the forward stroke of the handle. Cam 113 is actuated fromtotal-key'lever 118 by reason of engagement of a stud 119 on said cam ina slot 120 in the key lever 118, the key lever being pivoted at 121 onframe 1.

It will be observed that no locking stops are mounted on the stop leversA and B, so that a cipher will be always printed in each of thesecolumns unless a digit key is set in the key column associatedtherewith. This is desirable as it permits printing of a lefthand cipherin the tens or dime column in listing amounts less than 10 cents. Itwill be obvious, however, that the system of locking stops may beextended to include the two right-hand columns, by pivoting lockingstops similar to step c on stops levers A and B.

The third sector 32 from the right of the machine is preferably providedwith period or decimal point types 39 alongside the numeral types 0? to9, inclusive, thereon.

The throw of the main operating handle 14 is limited by engagement of astud 124 on frame 1 with the opposite ends of an arcuate slot 125 in thecam 72.

What I claim is:

1. A zero printing control device comprising a movable cipher stop; alocking stop pivoted thereon; means operatively and directly connectingthe locking stop with the cipher stop to cause the former to move inunison with the latter to inactive position; and means carried 'by alocking stop of higher decimal orderrto movev the said locking stop oflower decimal order to inactive position without moving the associatedcipher stop.

2. A zero printing control device comprising a cipher stop mounted on ahorizontal pivot; a locking stop pivoted to the cipher stop on ahorizontal pivot; means operatively and positively connecting thelocking stop with the cipher stop to cause the locking stop to moveupwardly in unison with the cipher the locking stop and adapted to beloosely engaged by a locking stop associated with a cipher stop of thenext higher decimal order to move the said locking stop of lower decimalorder to inactive position without moving the associated lower ordercipher stop.

3. A zero printing control device comprisinga cipher stop pivoted on ahorizontal axis; a locking stop pivoted at one end to 10 thecipher stopon a horizontal axis to swing independently thereof to and from activeposition and normally seatin by gravity on the cipher stop so as toswinglmdily with the ci- 1 pher stop when the latter is moved toinactive position; and means whereby the locking stop is adapted whenmoved to inactive position to move a locking stop associated with a nextlower denominational order type carrier to inactiveposition.

4. A zero printing control device comprising a cipher stop pivotallymounted on a horizontal axis and formed with an arm for cooperation witha stop lug on a type carrier; a freely swinging type carrier lockingstop pivotally mounted at its forward end on the cipher stop, its rearend engaging the cipher stop and projecting beyond it into the path ofthe type carrier lug; and a laterally ex tending lug carried by thelocking stop and overlying a locking stop of the next higherdecimal-order, whereby a cipher stop and its pivotally connected lockingsto will move together to inactive position an the locking stop may beindependently moved to inactive position by said locking stop of thenext higher decimal order. I In testimony whereof I hereunto aflix mysignature. CLARENCE ORIN MAPEL.

